delinquency vs neglectfulness

delinquency and neglectfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
delinquency	Yes	No	No	No
neglectfulness	Yes	No	No	No

As nouns, neglectfulness is a hypernym of delinquency; that is, neglectfulness is a word with a broader meaning than delinquency:

delinquency: a tendency to be negligent and uncaring
neglectfulness: the trait of neglecting responsibilities and lacking concern

Other hypernyms of delinquency include neglect, negligence.

delinquency (noun)	neglectfulness (noun)
an antisocial misdeed in violation of the law by a minor	the trait of neglecting responsibilities and lacking concern
a tendency to be negligent and uncaring
nonpayment of a debt when due